画像圧縮
オンラインで無料で画像を圧縮。品質を保ちながらファイルサイズを削減。JPG、PNG、WebP対応。
Upload an image to compress
Frequently Asked Questions
How do I compress an image without losing quality?
Use our free Image Compressor. Drag your image, adjust the quality slider to 80% — this typically reduces file size by 60-80% with minimal visible difference. The tool processes everything in your browser, so your files never leave your device.
What is the best image format for web?
WebP offers the best compression for web images — 25-35% smaller than JPEG at the same quality. Use our Format Converter to switch. For photos, JPEG at 80% quality is the sweet spot. For graphics with transparency, PNG is still your best bet.
Can I compress multiple images at once?
Currently our compressor handles one image at a time, but you can use our Batch Rename tool to organize files before processing. Each image takes just seconds to compress.
Is online image compression safe?
Yes — our compressor runs entirely in your browser. Unlike other tools, your images are never uploaded to any server. This means complete privacy and no file size limits.